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Significant Accounting Policies (Schedule Of Investment In Platinum) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
oz
Dec. 31, 2014
USD ($)
oz
Dec. 31, 2013
USD ($)
oz
Significant Accounting Policies [Abstract]      
Opening balance (in Ounces) | oz 514,614.2 537,256.0  
Creations (in Ounces) | oz 58,059.6 34,084.7  
Redemptions (in Ounces) | oz (106,420.5) (53,552.5)  
Transfers of platinum to pay expenses (in Ounces) | oz (2,986.3) (3,174.0)  
Closing balance (in Ounces) | oz 463,267.0 514,614.2 537,256.0
Opening balance $ 622,683 $ 729,594  
Creations 62,044 47,428 $ 218,288
Redemptions (111,353) (71,275)  
Realized (loss) / gain on platinum distributed for the redemption of Shares (31,912) (1,507) [1] 225 [1]
Transfers of platinum to pay expenses (3,237) (4,429)  
Realized (loss) / gain on platinum transferred to pay expenses $ (791) $ 113 [1] 151 [1]
Realized loss on investment in platinum  
Change in unrealized loss on investment in platinum $ (133,465) $ (77,241) [1] 0 [1]
Closing balance $ 403,969 $ 622,683 $ 729,594
[1] Represents audited amounts prior to the adoption of provisions for an investment company for accounting purposes. Refer to Note 2.1 for additional information.